Numerical classification and ordination of shrub communities on Haitan Island, Fujian, China

doi:10.17521/cjpe.2024.0249

Abstract

Abstract:

Shrublands are widely distributed across various islands in China. They have important ecological effects, such as conserving soil and water and protecting biodiversity. In this study, we established 95 sample plots on Haitan Island, Fujian, China, using a standard sampling method. Species composition, quantitative characteristics, and habitat information of the shrublands were recorded. Two-way indicator species analysis (TWINSPAN) and redundancy analysis (RDA) were employed for the numerical classification and ordination, respectively. The results showed that: 1) The typical shrublands in the study area can be classified into two categories, one dominated by native plants and the other by exotic species, including 11 alliances and 23 associations in total. Among them, Eurya emarginata and Dodonaea viscosa shrublands were the predominant alliances. 2) The RDA ordination revealed that the shrublands dominated by native species and by exotic species were different in the factors affecting the distribution. The native plant communities were mainly influenced by wind speed and mean annual precipitation, followed by distance from the coastline, total soil soluble salts content, and available nitrogen content. However, the exotic plant communities were likely influenced by multiple factors but the main drivers remained unclear. This study provides original data on the shrublands of Haitan Island, filling the knowledge gap in the shrubland information in this area and offering important foundational information for the compilation of the Vegegraphy of China and the creation of the national vegetation map.

Key words: Haitan Island, shrubland communities, numerical classification, TWINSPAN, RDA

CHEN Ying, WANG Ying-Xue, DENG Qing-Ya, LI Pei-Yang, XIAO Zi-Xin, XU Yan-Rong, DENG Chuan-Yuan. Numerical classification and ordination of shrub communities on Haitan Island, Fujian, China[J]. Chin J Plant Ecol, 2025, 49(4): 653-666.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2024.0249

https://www.plant-ecology.com/EN/Y2025/V49/I4/653

Figures/Tables 5

Fig. 1 Distribution map of the sampling plots for the typical shrubland communities on Haitan Island.

Fig. 2 TWINSPAN classification tree for the shrubland communities on Haitan Island. D, the classification level; n, the number of plots in the group; 1-95, sampling numbers.

Box 1 Identification key to the Eurya emarginata shrublands on Haitan Island

Box 2 Identification key to the Dodonaea viscosa shrublands on Haitan Island

Fig. 3 Redundancy analysis (RDA) diagram illustrating the relationship between the native plant-dominated shrubland communities on Haitan Island and the environmental factors. AN, alkali hydrolyzed nitrogen content; D, distance of the sampling plot from the coastline; MAP, mean annual precipitation; S, total soil water-soluble salts content; TP, total phosphorus content; WS, wind speed. Eurya emarginata - Dianella ensifolia Evergreen Broadleaf Shrubland Association (plot number P41, P44, P45, P48, P49, P51, P52, P62); Eurya emarginata - Dicranopteris pedata Evergreen Broadleaf Shrubland Association (P31-P37); Eurya emarginata - Miscanthus floridulus Evergreen Broadleaf Shrubland Association (P15-P17, P50); Eurya emarginata - Ischaemum aristatum Evergreen Broadleaf Shrubland Association (P56, P64, P68, P77-P80, P83); Eurya emarginata - Zoysia japonica Evergreen Broadleaf Shrubland Association (P65-P67, P81, P82); Eurya emarginata - Cynodon dactylon Evergreen Broadleaf Shrubland Association (P57-P63); Eurya emarginata + Dodonaea viscosa - Dianella ensifolia Evergreen Broadleaf Shrubland Association (P46, P47); Dodonaea viscosa - Dianella ensifolia Evergreen Broadleaf Shrubland Association (P53, P55, P74, P76, P84, P89, P90); Dodonaea viscosa - Bidens pilosa Evergreen Broadleaf Shrubland Association (P11-P14, P22, P30); Dodonaea viscosa - Miscanthus sinensis Evergreen Broadleaf Shrubland Association (P18-P21, P23, P24, P26, P27); Dodonaea viscosa - Pogonatherum crinitum Evergreen Broadleaf Shrubland Association (P38-P40, P42, P43); Dodonaea viscosa - Imperata cylindrica Evergreen Broadleaf Shrubland Association (P8); Dodonaea viscosa + Litsea rotundifolia var. oblongifolia - Dianella ensifolia Evergreen Broadleaf Shrubland Association (P73); Litsea rotundifolia var. oblongifolia - Dianella ensifolia Evergreen Broadleaf Shrubland Association (P72, P85-P88); Litsea rotundifolia var. oblongifolia - Setaria viridis Evergreen Broadleaf Shrubland Association (P54, P71, P75); Elaeagnus oldhamii - Bidens pilosa Evergreen Broadleaf Shrubland Association (P3).

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